The port editor used to serialise ten of the twelve columns, so saving
any port on an app silently discarded that app's Traefik subdomain and
the router fell back to the app-name default. Navidrome lost "music" and
Speedtest lost "speedtest" exactly that way, and nothing reported it —
the app kept working, on the wrong hostname.
The writer is fixed, but an install already carrying the damage would
keep it forever: reconcile preserves the user's value, and a truncated
row IS the user's value as far as it can tell. It now tops such a row up
from the template, appending ONLY the columns the live row does not
reach. Everything the live row states wins — including a deliberately
blanked column — so clearing a subdomain is not undone, and a live row
longer than its template is left alone.
Two faults of my own, caught while testing it end to end:
The notice was printed on stdout. This function returns its result
through a command substitution, so the notice text was captured INTO the
config value and written to navidrome's descriptor. It goes to stderr.
The width in the message was measured after the merge, so it reported
the post-merge count as the "before". Captured up front instead.
Verified against a live install: truncating navidrome's row to 9 columns
and running `config check` restores it to 11 with "music" intact, a
second run changes nothing, and no port on the box is left Traefik-
managed without a subdomain. Unit-checked that it declines to act on a
complete row, a non-port key, a row longer than its template, and never
overwrites a live value; quoting style is preserved either way.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
aa4f1f1d9c